河套盆地临河坳陷石油地质特征与油气富集规律  

Petroleum geological features and hydrocarbon enrichment of Linhe Depression in Hetao Basin,NW China

作　　者：张锐锋 何海清 朱庆忠 陈树光 刘喜恒 淡伟宁 胡延旭 师玉雷 张宇飞 于海军 张晰蒙 ZHANG Ruifeng;HE Haiqing;ZHU Qingzhong;CHEN Shuguang;LIU Xiheng;DAN Weining;HU Yanxu;SHI Yulei;ZHANG Yufei;YU Haijun;ZHANG Ximeng(PetroChina Huabei Oilfield Company,Renqiu 062552,China;PetroChina Oil&Gas and New Energy Company,Beijing 100007,China;Logging Technology Research Institute of CNPC Logging Company,Beijing 100007,China;No.2 Mud Logging Company,CNPC Bohai Drilling Engineering Company Limited,Renqiu 062552,China)

机构地区：[1]中国石油华北油田公司,河北任丘062552 [2]中国石油油气和新能源分公司,北京100007 [3]中国石油集团测井有限公司测井技术研究院院士工作站,北京100007 [4]中国石油渤海钻探第二录井分公司,河北任丘062552

出　　处：《石油勘探与开发》2023年第4期695-705,共11页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司“前瞻性、基础性”重大攻关课题“河套盆地油气富集规律与勘探关键技术研究”(2021DJ0703)。

摘　　要：基于古地貌、钻井和地震资料,对河套盆地临河坳陷构造沉积演化、烃源岩特征、储集层特征及形成机制、油气成藏模式与富集规律进行系统研究。结果表明:①河套盆地主要历经“弱伸展断拗期、强伸展断陷期和走滑改造期”3期成盆演化过程,发育吉兰泰、沙布、纳林湖、兴隆等4大环洼正向构造带,为油气富集成藏的有利区带;②发育下白垩统固阳组、渐新统临河组两套主力咸化湖相烃源岩,具有高含硫富藻、早熟早排、生油窗口宽的特征;③河套盆地周缘山间大型构造转换带控制形成大型辫状河三角洲沉积,三角洲前缘砂体具有石英含量高(50%~76%)、长期浅埋弱压实、胶结物含量低、储集层物性好的特点,预测古近系有效储集层埋深达8000 m;④构建邻洼鼻隆、环洼潜山、近源断鼻3种油气成藏模式,临河坳陷油气富集规律为“环洼近源是基础、优质厚储集层是前提、良好的构造背景和圈闭条件是关键”。Based on paleogeomorphology,drilling and seismic data,this paper systematically studies the structural and sedimentary evolution,source rock characteristics,reservoir characteristics and formation mechanism,hydrocarbon accumulation model and enrichment law in the Linhe Depression of the Hetao Basin,NW China.The Hetao Basin mainly experienced three stages of evolution,namely,weak extensional fault depression,strong extensional fault depression and strike-slip transformation,giving rise to four positive structural belts(Jilantai,Shabu,Nalinhu and Xinglong),which are favorable areas for oil and gas accumulation.The two main saline lacustrine source rocks,Lower Cretaceous Guyang Formation and Oligocene Linhe Formation,are characterized by high sulfur content,rich algae,early maturity,early expulsion,and wide oil generation window.The large structural transition belt in the intermountain area around the Hetao Basin controls the formation of large-scale braided river delta deposits,which are characterized by high quartz content(50%–76%),long-term shallow burial and weak compaction,low cement content,and good reservoir properties in delta front sandbody.The burial depth of the effective Paleogene reservoirs is predicted to reach 8000 m.Three hydrocarbon accumulation models,nose-uplift near sag,buried hill surrounding sag,fault nose near source rock,are constructed.The law of hydrocarbon accumulation in the Linhe Depression is finally clarified as follows:near-source around the depression is the foundation,high-quality thick reservoir is the premise,good tectonic setting and trap conditions are the key.

关 键 词：河套盆地 临河坳陷 白垩系固阳组 古近系临河组 吉兰泰油田 巴彦油田 油气富集规律 

分 类 号：TE121.1[石油与天然气工程—油气勘探]